View Compilation Error

0_0_36081330_25610.cpp: In function 'int main()':
0_0_36081330_25610.cpp:10:3: error: 'String' was not declared in this scope
   String str="";
   ^
0_0_36081330_25610.cpp:11:15: error: 'str' was not declared in this scope
   scanf("%s",&str);
               ^